Ribbed pulley.



(No Model.)

ZM/@Q7 Patented oct. 29, 190|. M. L. GALLowAYaL v. w. wHvMAN.

RIBBED PULLEY.

(Application led Apr. 15, 194211.;

vTATns PATENT Teton.'

MARTIN L. GALLowAY AND vIoToR vv.l WHYMAN, on ADAMS, NEBRASKA.

RIBBi-:D PULLEY.

SPEUFCATION forming part of Letters Patent N o. 685,680, dated October 29, 1901.

Application iiled April 1,5, 1901. Serial No. 55,959. (No model.)

.To @ZZ whom t may concern: i

Be it known that we, MARTIN L. GALLOWAY and VICTOR W. WHYMAN, citizens of the United States,residingat Adamsnnthe county of Gage and State of Nebraska, have invented a new and useful Ribbed Pulley, of which the following is a specification.

This invention relates to pulleys; and the@ 'object of the present improvement is to provide a pulley with ribs having such reverse angle from opposite ends toward and merging into ak central circumferential swell that a belt will be prevented from slipping therefrom and be forced toward the center of the pulley and also be checked in any tendency to slip around the pulley, whereby the speed of the belt or another similar pulley which it engages will always be uniform, especially in machinery under a heavy strain of a variA able character, another advantage being particularly apparent where a small pulley'is driven by a larger one, both embodying the ribbed construction, and where a uniform` speed is desired.

The invention consists in the construction and arrangement of the several parts, whichl will be more fully hereinafter described and claimed. f

In the drawings, Figure 1 is a perspective view of a pulley embodying the features of the invention. Fig. 2 is a longitudinal vertical section of the same. Fig. 3 is an end elevation thereof.

Similar numerals of reference are employed to indicate corresponding parts in the several views.

The numeral l designates a hub,from which a web 2 extends to'a rim 3 of any suitable extent provided with a central circumferential swell or enlargement 4 of curved surface contour and from whichthe bearing-surface of the rim gradually slopes toward opposite ends, as clearly shown by Fig. 2. The bearing-surface of the rim which directly has contact with the belt is formed with a plurality of regularly-spaced parallel ribs 5 and 6, extending completely therearound and arranged in reverse angles in relationv to each other. The said ribs extend inwardly from opposite ends of the pulley or the rimA toward the center obliquely to the longitudinal axis of theV pulley and vanish in the swell or enlargement 4 at the center of the latter. The ribs also partake to a slight degree of the slope of the outer surface of the rim from the swell or enlargement 4 toward the opposite ends of the rim, and said ribs also gradually decrease in vertical thickness or extent from the opposite ends of the rim toward the said swell or enlargement 4. Itis proposed to form the pulleyof wood, metal, or other suitable material in large, small, and intermediate sizes and to apply it to all kinds of machinery and uses to which it is adapted. Itis not necessary that the exact formation of hub and web shown be usedv nor that the rim extend beyond the web, so long as the essential features are vembodied in the construction, and

which are the central swell or enlargement 4 i and the ribs 5 and 6,`disposed and arranged as set forth.

- The advantages of the improved form ofy pulley are manifold, and among many others v may be particularly mentioned the prevention of slipping of a belt around the pulley,

because the ribs present obstructions of a positive nature'to overcome any such tendency;

that the belt-bearing surface of the rim does not have to be covered with some kind of antislipping material; that a belt will be prevented-from laterally slipping off thel pulley Whether it be in direct alinement with the driven or driving device or not7 because the beltwill be drawn toward the center of the ent to those using the improved device, and l in view of the cheapness of manufacture of= the device and the `superior lregular speed advantages it will be a valuable acquisition to the art.

Having thus described the invention, what` l. As an improved article of manufacture, a pulley having a rim with a belt-engaging surface having a central enlargement or swell I extending circumferentially thereof and oppositely-disposed reversely-arran ged angular ribs extending inwardly to and merging into the said enlargement or swell.

ICO

2 se5,6o

2. As an improved article of manufacture, l gradually decreased toward the said swell or a pulley having a rim with a belt-engaging surface formed with a central circumferentially-extending swell or enlargement from which the said surface slopes downwardly toward the opposite ends of the rim, and ribs arranged in reverse angles to each other 4on opposite sides of and merging into the said swell or enlargement, the said ribs completely encircling the rim in regular-spaced parallel relation and having their vertical thickness enlargement.

In testimony that we claim the foregoing as our own we have hereto affixed our signatures 15 in the presence of two witnesses.

MARTIN L. GALLOWAY. VICTOR W. WHYMAN;

Vitnesses:

R. C. PEARsoN, A. P. WIAR. 

